gpgkeymgr is a tool for cleaning up and managing your GnuPGP key ring. It removes old and unnecessary keys according to user-specified criteria. For example, you can remove all expired or revoked keys, or all keys you don't trust, and much more.
oobash is an oo-style framework for bash 4 written in bash. It provides tools for rapid script development and huge libraries.
Bidirectional RPC support over a simple message interface, e.g. WebSocket.
A camera app for Android.